Watkins Thermistor Hot Spot & Solana

This is the replacement thermistor for the

• 1999-2002 Hot Spot RE,
• RLX
• SE
• SLX
• 2001-2002 SLXtra (wood sided) spa models.
• Solana 2000-2002 X,
• 2003-2005 RX,
• SX and TX models.

The Thermistor communicates the actual water temperature to the controller to shut off the heater when the spa reaches target temperature.

Test Procedure

• 1. Set the meter to 20K on the OHM scale.
• 2. Record the temperature of the spa water.
• 3. Unplug the thermistor from the control box.
• 4. Meter across the two Thermistor leads.
• 5. Refer to the Temperature versus Resistance chart below to find the correct resistance value for the temperature measured.

If the temperature and resistance does not match that of the chart, this test has failed and the thermistor must be replaced, If the spa has been inactive, the spa water temperature may be different than the water temperature in the heater housing.

The topside control panel will display "Prr" which indicates that this part has failed.